Armor or sheating for electric conductors.



Patented Feb. ll, I902.

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UNITED STATES PATENT ()FFICE.

EMIL WITZENMANN, OF PFORZHEIM, GERMANY.

ARMOR OR SHEATHING FOR ELECTRIC CONDUCTORS.

SPECIFICATION formingpart of Letters Patent N 0. 692,960, dated February 11, 1902. Application filed November 16, 1901i. Serial No. 82,527. (No model.)

To aZZ whom, it may concern:

Be it known that I, EMIL WITZENMANN, manufacturer, a subject of the Grand Duke of Baden, residing at 4.8 Holzgartenstrasse, Pforzheim, Germany, have invented certain new and useful Improvements in Armor or Sheathing for Electric Conductors, of which the following is a specification.

I The subject of the present invention is an improved armor or sheathing for electric conductors and the like.

The new armor possesses the special advantages, first, of lying closely against the conductor at bends or curves, and, secondly, of admitting of the sheathing at any desired place or places being readily taken apart and given another form, whereby any required part of the conductor is rendered accessible for repairs, the.

The improved armor is illustrated by the annexed drawings.

Figure l is a part-sectional view of a portion of a bent conductor armored with the'new sheathing, the center of the bend being broken 7 away. Fig. 2 is a like view of the armored conductor after the bent spiral portion of the sheathing has been disconnected at one coupling and compressed so as to expose the inclosed conductor at the part. Fig. 3 is a view drawn to a smaller scale and showing a portion of a conductor-sheath consisting of three lengths of spiral armor coupled together. Figs. 4 and 4 are detail sectional views drawn toan enlarged scale and illustrating one manner in which the spirals of the sheath may be constructed. Fig. 5 is a like detail sectional view drawn to the same scale as Figs. 4 and at and illustrating another manner of forming the spiral armor.

For the armor shown in Figs. 1 and 2 a metallic spiral hose 0 is employed consisting of very broad coiled band, so that the hose admits to a large extent of being telescoped. Inthis case to expose the incased cable b it is only necessary to loosen one of the couplings Ct a-for example, the lower coupling and to push the loose end of the spiral hose 0 upward, as shown in Fig. 2. In this manner the lower part of the bend in the cable I) is exposed. If the upper part of the bend in the cable is to be repaired, the process is reversed-that is to say, the upper coupling at is loosened and the upper end of the spiral hose pushed downward, so as to telescope the hose. As a rule it is only to the bends in cables to which such spiral hose is applied, the remainder of the cable-armor being composed of rigid or other tubing Z. The new armor may also be so arranged that lengths of cable of any desired extent may be exposed. In such case a number of portions of spiral hose 0 are coupled together,with capability of ready disconnection, as shown in Fig. 3. If for this purpose a metallic spiral hose is again employed so arranged that it can be compressed so as to become shorter than in the ordinary drawn-out condition, then, supposing the total length of the armored cable to be about ten meters, by loosening or disconnecting the coupling f of the armor and pushing the three portions 0 toward the coupling d, assuming that the spiral hose admits of thirty per cent. compression, three meters of the length fe in part I can be exposed. By loosening or disconnecting the coupling e and pushing the hose in the direction of the couplingfone meter of the part I will be exposed. By loosening or disconnecting the coupling e and pushing the armor toward the coupling d two meters of the cable of part II can be exposed. By loosening the coupling 9 and pushing the armor toward the couplingf likewise two meters of cable in part II may be exposed. By loosening the coupling 9 and pushing the armor toward coupling 61 one meter of part III maybeexposed, and finally by looseningthe coupling d and pushing the armor toward the couplingf three meters of part III may be exposed. It is thus clear that in the manner above described every portion of the cable between f and d can be exposed.

A metallic spiral hose possessing the required high degree of compressibility can be manufactured in Various ways. It may be made by spirally winding one very wide band of metal, as above mentioned, or instead of employing only one strip two strips h t, engaging in each other, as shown in Figs; 4 and l, may be wound. Fig. 4 shows by sectional view the position of the strips relatively to one another when the hose is drawn out, and Fig. 5 the same when the hose is telescoped. The hose may also be manufactured,as shown in Fig. 5, of a single metallic strip provided in well-known manner with packed joints 70, this latter system being particularly serviceable when an armor is required which is proof against the penetration of liquids.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. An armor for electric conductors and the like, comprising lengths of metallic spiral hose capable of being compressed longitudinally, secured together at their ends by couplings capable of being readily loosened or disconnected, whereby the whole of the incased conductor may be exposed piece by piece,sub-

stantially as described.

Witnesses HERMANN HAHN, ERNST ENTCUMAR. 

